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首页> 外文期刊>The Journal of Horticultural Science & Biotechnology >Changes in tissue-water relations, photosynthetic activity, and growth of Myrtus communis plants in response to different conditions of water availability.
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Changes in tissue-water relations, photosynthetic activity, and growth of Myrtus communis plants in response to different conditions of water availability.

机译：响应于不同的水分供应条件，水草的组织水关系，光合活性和生长的变化。

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摘要

The influence of different levels of water deficit on physiological and morphological alterations in Myrtus communis plants was investigated to evaluate their adaptability to such conditions. M. communis plants, growing under greenhouse conditions, were subjected to three irrigation treatments between February and August 2007: a control, and two water deficit treatments. Plants submitted to severe water deficit showed reduced shoot and root dry weights, leaf numbers, leaf areas, and plant heights, while moderate water deficit reduced only plant height. Leaf colour was not affected by either water deficit treatment. Root hydraulic resistance increased in proportion to the level of drought, and lower values of leaf water potential ( Psi l) were observed at pre-dawn in both deficit treatments. The absence of osmotic adjustment could explain the reduction of leaf turgor potential at midday. Photosynthesis decreased in both water deficit treatments and was related to stomatal factors, since no significant changes in chlorophyll fluorescence, chlorophyll content, or ion leakage were observed. The highest Psi l values were found in the early morning, and the lowest at midday, in all treatments. The latter coincided with the minimum values of stomatal conductance. Significant differences in Psi l values during the day were noted between treatments, but were always highest in the control. Cell wall rigidity, measured as an increased bulk modulus of elasticity, increased under severe water stress, resulting in a loss of turgor at lower Psi l values.
机译：研究了不同水平的水分亏缺对M草（Mytus communis）植物生理和形态变化的影响，以评估其对这种条件的适应性。 M。在温室条件下生长的普通植物在2007年2月至2007年8月之间进行了三种灌溉处理：对照和两种缺水处理。遭受严重缺水的植物显示出降低的枝和根干重，叶数，叶面积和植物高度，而适度的缺水仅降低了植物高度。叶片的颜色不受任何缺水处理的影响。两种缺水处理均在黎明前观察到根系水力阻力与干旱水平成正比，并且叶片水势值较低（Psi l ）。没有渗透调节可以解释中午叶片膨大潜力的降低。在两种水分亏缺处理中，光合作用均下降，并且与气孔因素有关，因为未观察到叶绿素荧光，叶绿素含量或离子渗漏的显着变化。在所有处理中，Psi l 值最高，出现在清晨，最低值出现在中午。后者与气孔导度的最小值相吻合。两组之间在一天中的Psi l 值存在显着差异，但在对照组中始终最高。在严重的水分胁迫下，以增加的体积弹性模量衡量的细胞壁刚度增加，导致在较低的Psi l 值下失去膨胀。

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